A brother passes by his sister's panties while she is cutting her nails on one knee and can't help but take a peek. I think I'll cut my nails too. Saying this, he takes the nail clipper from his sister after she has finished cutting her nails. When the brother goes to his room, he starts masturbating while smelling the nail clipper that his sister has cut. Around his brother are his sister's hair ties, socks, used toothbrushes, etc., and he loves his sister and masturbates to her goods on a daily basis. Suddenly, his sister suddenly comes into his room without knocking. Before he can hide the dick he is stroking, his sister sees him. His sister apologizes, "Ah! I'm sorry!", but when she realizes that he is using her personal belongings as a masturbation aid, she becomes furious. At first, she runs out of the room, but after calming down for a while, her sister knocks and visits her brother's room. "We live together and it would be awkward if it was awkward from tomorrow onwards. I'll be your masturbation aid just for today, so I want you to stop doing this kind of thing from now on." And then...